Star Forge also and fully unlocked + sub for months. Now about your question on buying some of them or not, well they've been sitting in that inventory for a long while so i can't tell you for sure if i didn't buy some of them at one point. But i am also farming them actively and constantly...
There's no limit, i can drag full stacks of 9-10.000 from other resources. Those that i mentioned above are completely stuck in the materials inventory. Maybe i'm not the only one with this problem?
examples: Prototype Lustrous Artifact Fragment, Prototype Lustrous Bondar Crystal, Premium Data Spike, Prototype Data Spike
just wanted to sell some on gtn and realised that they're stuck in the mats inv... like is this normal?
As the title says, 90% of the time it is during battles, the cape goes all wild and stuff... It is a cool golden set so i thought it's worth mentioning it.